Something that I've been wondering - what would happen if hypothetically, more than one country had the same artist representing it? Would one of them have to change, or would they both be allowed?

Depending on QF/SF lineups it can impact one or both songs chances. If they're in the same QF/SF people tend to prefer one so the other usually ends up going out however with Helene Fischer it was fine because both were separated until the Final.

As it's contest 100, we've not had an update of this for a while, the overall leaderboard for all 99 contests so far (12 points for 1st place, 10 for 2nd etc, down to 1 point for 10th), with thanks to AxG for compiling the list on the Wiki.